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Intel® Server Board SE7520JR2 Platform Management
Revision 1.0
C78844-002
125
The following figure shows the power supply control signals and their sources. To turn on the
system, the mBMC asserts the Power On signal and waits for the Power Good signal to assert
in response, indicating that DC power is on.
Figure 23. Power Supply Control Signals
The mBMC uses the Power Good signal to monitor whether the power supply is on and
operational, and to confirm whether the actual system power state matches the intended system
on/off power state that was commanded with the Power On signal.
De-assertion of the Power Good signal generates an interrupt. The mBMC uses this to detect
either power subsystem failure or loss of AC power. If AC power is suddenly lost, the mBMC:
1. Immediately asserts a system reset.
2. Powers down the system.
3. Waits for configured system off time, then attempts to power the system back up,
depending on system power restore policy.